﻿// Jinx AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using Core;
namespace Formality.FormalSystem
{
    public class Variable : Tuple<string, int>
    {
        public Variable(string Name, int BindingNumber)
            : base(Name, BindingNumber)
        {
        }

        public Variable(string Name) : this(Name, 0)
        {
        }

        public bool Free
        {
            get { return BindingNumber == 0; }
        }

        public bool Bound
        {
            get { return !Free; }
        }

        public string Name
        {
            get { return Item1; }
        }

        public int BindingNumber
        {
            get { return Item2; }
        }

        public string Detailed
        {
            get { return ToString(StringingStyle.Detailed); }
        }

        public string ToString(StringingStyle Style)
        {
            if (Style == StringingStyle.Detailed)
                return Name + BindingNumber;
            return Name;
        }

        public override string ToString()
        {
            return ToString(StringingStyle.Default);
        }

        public static implicit operator Variable(string Name)
        {
            return new Variable(Name);
        }
    }
}